Honda CRF150F Owner's Manual page 169

Engine Oil
Engine oil quality is the chief factor affecting
engine service life. Change the engine oil as
specified in the maintenance schedule (page
46).
When running in very dusty conditions, oil
changes should be per for med more
frequently than specified in the maintenance
schedule.
Please dispose of used engine oil in a manner
that is compatible with the environment. We
suggest you take it in a sealed container to
your local recycling center or ser vice station
for reclamation. Do not throw it in the trash
or pour it on the ground or down a drain.
Used engine oil may cause skin cancer if
repeatedly left in contact with the skin for
prolonged periods. Although this is unlikely
unless you handle used oil on a daily basis, it
is still advisable to thoroughly wash your
hands with soap and water as soon as possible
after handling used oil.
58
Changing the oil requires a torque wrench.
If you do not have it and the necessary skill,
we recommend that you have your Honda
dealer perform this service.
If a torque wrench is not used for this
installation, see your Honda dealer as soon
as possible to verify proper assembly.
Change the engine oil with the engine at
normal operating temperature and the
motorcycle on its side stand to assure
complete and rapid draining.